Multiple bug fixes

【Contents of fixes】
■Added support for WP5.6 (compatible with jQuery version upgrade)
■Changed Facebook OGP setting from old specification (fb:admins) to new specification (fb:app_id)
※Please refer to the following article about how to get “fb:app_id” (application ID)
　How to get fb:app_id required for Facebook OGP setting. ID required for Facebook OGP setting
■Optimizing OGP Tags
■【Mac】Fixed a bug that the thickness of Japanese and European characters may be displayed differently when using some fonts.

The following files have been fixed in this update.
【Fixed files】
admin/inc/basic.php
admin/theme/options.php
comments.php
editor-style-04.css
functions/head.php
functions/head_bk.php
functions/ogp.php
functions/seo.php
languages/en.mo
languages/en.po
pagebuilder/assets/css/pagebuilder.css
style.css

【Added files】
js/jquery.easing.1.4.js

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